[GLLUG] Replacement disk in RAID

[John Winters]

On 30/04/2023 08:04, Dr. Axel Stammler via GLLUG wrote:
> Good morning,
> 
> one of four hds in my LVM2 raid has stopped reacting to SMART commands 
> or anything else. The 16 TB raid system contains four 8 TB hds in a RAID 
> 1 set of two RAID 4 pairs:
> 
> RAID 1 ┌ RAID 4 ┌ A
>         │        └ B ← needs to be replaced
>         │ RAID 4 ┌ C
>         └        └ D

I'm a bit out of practice with RAID, but how can you have a RAID 4 array 
with only two disks?  I thought RAID 4 had a dedicated parity disk?

John

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